Drill attachment precision verifier



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'0. l. DURST ET AL DRILL ATTACHMENT PRECISION VERIFIER Feb. 11,1958

Filed Sept. 15, 1956 ATI'D R N EYS DRILL ATTACHMENT PRECISION VERIFIERCharlie I. Durst and Hazel Thompson, Long Beach, Calif.

Application September 13, 1956, Serial No. 609,741

3 Claims. (Cl. 33-46) This invention relates to a drill, and moreparticularly to an accessory for use with an electric drill.

The object of the invention is to provide an accessory which will permitan electric drill to be used with greater precision and facility.

Another object of the invention is to provide an attachment for use withan electric drill, the attachment including a light bulb or light sourcewhich is adapted to pass light through a housing that is detachablyconnected to the drill so that the job of properly lining up the drillis facilitated.

A further object of the invention is to provide an electric drillattachment which is extremely simple and inexpensive to manufacture.

Other objects and advantages will be apparent during the course of thefollowing description.

In the accompanying drawings, forming a part of this application, and inwhich like numerals are used to designate like parts throughout thesame:

Figure 1 is a side elevational view illustrating the attachment of thepresent invention mounted on a drill.

Figure 2 is a longitudinal sectional view taken on the line 22 of Figure3.

Figure 3 is a sectional view taken on the line 3--3 of Figure 2.

Figure 4 is an end elevational view illustrating the attachment of thepresent invention on the drill.

Figure 5 is a fragmentary sectional view illustrating the connection ofthe accessory to the drill.

Figure 6 is a perspective view illustrating certain structural detailsof one of the sights.

Referring in detail to the drawings, the numeral 10 designates aconventional drill which includes the usual trigger 11, chuck 12 anddrill bit 13.

The present invention is directed to an accessory or attachment for usewith the drill 10 whereby the drill can be used with greater precisionand facility. The attach ment of the present invention is indicatedgenerally by the numeral 14 and there is further provided a meanswhereby the attachment or accessory can be detachably connected to thedrill 10. This means comprises a support member which is indicatedgenerally by the numeral 15, and the support member 15 includes a curvedflange 16 which is secured to the outer surface of the drill 10 throughthe medium of suitable securing elements 17.

Extending outwardly from the flange 16 and secured thereto or formedintegral therewith is a rib 18 which has a tongue 19 secured thereto orformed integral therewith. The tongue 19 coacts with the rib 18 and withthe flange 16 to define a pair of opposed trackways or slots 20 for apurpose to be later described.

There is further provided a body member which is indicated generally bythe numeral 21, and the body member 21 is detachably connected to thesupport member 15. The body member 21 includes a pair of spaced parallelwalls 22 which have lips or flanges 23 thereon, and the lips 23 aresecured to a hollow housing 25 through the medium of securing elements24. Extending inwardly ice from the walls 22 and secured thereto orformed integral therewith is a pair of opposed fingers 26 which areslidably mounted in the trackways 20. Extending between the pair ofwalls 22 and secured thereto is a partition 27, and a plurality ofspring members 28 are interposed between the partition 27 and the tongue19, the spring members 28 helping to maintain the accessory immobile inits adjusted position on the drill 10.

Mounted on the rear end of the housing 25 is a cap 29 which has areflector 30 supported therein, there being a light bulb 31 contiguousto the reflector 30. Wires 32 are provided for connecting the bulb 31 toa suitable source of electrical energy. Arranged forwardly of thereflector 30 is a lens 33. Mounted on the front end of the housing 25 isa front cap 34 which has a lens 35 arranged contiguous thereto. Mountedin the housing 25 in spaced apart relation with respect to each other isa pair of sights which are arranged in the form of a cross. Thus, eachsight 36 may include wires 37 which are arranged at right angles withrespect to each other, and the central portions of the wires 37 maysupport enlarged body pieces 38.

From the foregoing it is apparent that there has been provided anaccessory or attachment which is especially suitable for use with a toolsuch as the electric drill 10. In use, the drill 10 is provided with theplurality of support members 15 as shown in Figure 1 so that the accessory 14 can be arranged in any one of several different positions on thedrill. Thus, as shown in Figure 1 the accessory is mounted on the top ofthe drill, but it is to be understood that if desired the accessory canbe attached to the side of the drill. To attach the device to the drill,it is only necessary to slide the body member 21 into engagement withthe support member 15 so that the housing 25 will be retained in itsproper position. Thus, as shown in the drawings, the body member 21 isprovided with a pair of walls 22 which include the inwardly extendingopposed fingers 26 which snugly project into the trackways 20 which areformed between the tongue 19 and the flange 16. The pair of springmembers 28 help maintain the housing 25 immobile in its adjustedpositions since the springs 28 exert pressure between the partition 27and the tongue 19, as shown in Figure 5. Thus, when it is desired toremove the assembly 14, it is only necessary to manually slide theaccessory endwise of the drill so that the housing 25 and body member 21can be readily detached from the support member 15 when the device isnot being used. Furthermore, the housing 25 includes the light bulb 31which has its rays passing through the lens 33 and the rays of lightwill then pass through the housing 25 and out through the lens 35.Arranged within the housing are the pair of cross shaped sights 36 whichare adapted to cast a shadow upon a suitable reference point so that theoperator of the drill can readily and properly position the drill bit 13at the proper location. Thus, since the pair of cross shaped sights 36will cast a shadow upon a reference point, the job of properlypositioning the drill bit 13 is greatly facilitated, and guess work iseliminated. The light bulb 31 can be connected to a suitable source ofelectrical energy by means of the wires 32, and a suitable switch can beprovided for controlling actuation or energization of the bulb 31.

With the attachment of the present invention the drill 10 can be usedwith greater precision and accuracy. The device can be arranged on topof or at either side of the drill and when the light bulb 31 isactuated, there will appear the two shadow lines which are arranged atright angles with respect to each other. Due to the provision of thepair of sights 36, the operator can readily tell when the tool isproperly aligned by observing when the shadows cast by the pair ofsights coincide. As the drill is moved from place to place the shadowwhich is cast by the sights will also move so that the drill can be usedin different localities and whereby the intersection of the shadow linescan be focused on a suitable reference point which will insure that thedrill bit 13 is properly positioned or aligned. The wire 32 may beconnected to the same electrical power source which is used foractuating the drill 10. When the device 14 is not being used it can bereadily removed from the drill.

The present invention is especially suitable for use in high tolerancework such as in aircraft assembly work wherein bolt or rivet holes mustbe drilled with a high tolerance. Instead of using the pair of crossedwires 37 in the sight, other types of sights can be used as for examplethe combination of a circular member and a crossed wire may be used. Dueto the provision of the sights, in the event that the drill is moved toa position which is not perpendicular to the object being worked on, theshadow lines will so indicate so that the operator can correct theposition of the drill. Thus, with the present invention it is onlynecessary to keep the reflected shadows in their aligned positions sothat there will be no guess work involved in drilling holes properly andaccurately. The device will also function efficiently on curved surfacesas Well as in corners. The device is especially suitable for use inaircraft production work since it will facilitate the drilling of theholes in aluminum or the like, when such holes are to be used forreceiving screws, bolts, rivets or the like. The cross wires may be ofvarying widths and of different shapes and sizes. The size of the partscan be varied as desired, and the device can be made of any suitablematerial. The support members 15 provide seats for the body member 21which is secured to the housing 25 through the medium of the securingelement 24.

We claim:

1. In combination with a tool, a support member arranged contiguous tothe outer surface of said tool and including a curved flange secured tothe outer surface of the tool, a rib extending outwardly from saidflange intermediate the sides thereof, a tongue arranged on the outeredge of said rib and arranged in spaced apart relation with respect tosaid flange and coacting with said flange to define a pair of spacedapart opposed trackways, a body member detachably connected to saidsupport member and including a pair of spaced parallel walls, opposedfingers extending inwardly from an end of said walls and seated in saidtrackways, a partition arranged in said body member and extendingbetween said walls and secured thereto, resilient means interposedbetween said partition and tongue, a pair of spaced apart lips extendingoutwardly from said walls, a housing secured to said lips, a cap mountedon the rear end of said housing, a cap mounted on the front of saidhousing, a lens arranged in the front of said housing, a lens arrangedin the rear of said housing, a reflector spaced rearwardly from saidrear lens, a light bulb arranged contiguous to said reflector andadapted to be connected to a source of electrical energy, and a pair ofspaced apart sight pieces mounted in said housing and secured thereto.

2. In combination with a tool, a support member arranged contiguous tothe outer surface of said tool and including a curved flange secured tothe outer surface of the tool, a rib extending outwardly from saidflange intermediate the sides thereof, a tongue arranged on the outeredge of said rib and arranged in spaced apart relation with respect tosaid flange and coacting with said flange to define a pair of spacedapart opposed trackways, a body member detachably connected to saidsupport member and including a pair of spaced parallel walls, opposedfingers extending inwardly from an end of said walls and seated in saidtrackways, a partition arranged in said body member and extendingbetween said walls and secured thereto, resilient means interposedbetween said partition and tongue, a pair of spaced apart lips extendingoutwardly from said walls, a housing secured to said lips, a cap mountedon the rear end of said housing, a cap mounted on the front of saidhousing, a lens arranged in the front of said housing, a lens arrangedin the rear of said housing, a reflector spaced rearwardly from saidrear lens, a light bulb arranged contiguous to said reflector andadapted to be connected to a source of electrical energy, and a pair ofspaced apart sight pieces mounted in said housing and secured thereto,each of said sight pieces including a pair of wires arranged at rightangles with respect to each other, and cross shaped body piecessupported by the intersecting intermediate portions of said wires, saidresilient means comprising a plurality of spring members.

3. In a device of the character described, a curved flange, a ribextending outwardly from said flange intermediate the sides thereof, atongue arranged on the outer edge of said rib and arranged in spacedapart relation with respect to said flange and coacting with said flangeto define a pair of spaced apart opposed trackways, a body memberdetachably connected to said rib and including a pair of spaced parallelwalls, opposed fingers extending inwardly from said walls and seated insaid trackways, a partition arranged in said body member and extendingbetween said walls and secured thereto, spring members interposedbetween said partition and tongue, a pair of spaced apart lips extendingoutwardly from said walls, a hollow housing secured to said lips, a capmounted on the rear end of said housing, a cap mounted on the front ofsaid housing, a lens arranged in the front of said housing, a lensarranged in the rear of said housing, a reflector spaced rearwardly fromthe rear lens, a light bulb arranged contiguous to said reflector andadapted to be connected to a source of electrical energy, a pair ofspaced apart sight pieces mounted in said housing and secured thereto,each of said sight pieces including a pair of wires arranged at rightangles with respect to each other, and cross shaped body piecessupported by the wires.

References Cited in the file of this patent UNITED STATES PATENTS1,899,249 Walliser et al. Feb. 28, 1933 1,958,456 Warren May 15, 19342,072,286 Wellington Mar. 2, 1937 2,085,732r Baxter July 6, 19372,310,165 Steiner Feb, 2, 1943 2,407,845 Nemeyer Sept. 17, 1946 FOREIGNPATENTS 912,868 Germany June 3, 1954

